Bundle Strategies in Svelte. Configure in svelte.config.js

split - App will be split up in multiple .js and .css files. Files are lazy loaded as the user navigates the app. This is the default.

single - Creates one .js bundle and one .css bundle for the entire application.

inline - Inlines all .js and .css files in the HTML. The result can be usable without a server.

Svelte Docs (Configuration > Output > Bundle Strategy)